Adelges (Adelges) laricis Vallot, 1836

Albrecht, Anders Christian, 2017, Illustrated identification guide to the Nordic aphids feeding on Conifers (Pinophyta) (Insecta, Hemiptera, Sternorhyncha, Aphidomorpha), European Journal of Taxonomy 338, pp. 1-160 : 9

Adelges (Adelges) laricis Vallot, 1836

Figs 8–9

Diagnosis

Fundatrix about 2.5 mm, blue-green with long wax filaments. Al. gallicolae 1–2 mm, blackish, wax glands poorly developed, premarginal glands absent, wax wool sparsely produced; head with 4 separate wax gland plates; ant. III shorter than IV. Galls 5–15 mm, pale yellowish with a waxy texture, often with a slight pinkish tinge, widely dispersed, usually singly on their branch; terminal or with very restricted plant growth beyond the gall; chambers not completely closed: nymphs often seen on outer gall surface. Galls opening in June–July. Holocyclic and dioecious, alternating between Picea and Larix (see also p. 24). Mixed spruce forests, rarely in moist or shady positions, also on solitary trees.

Recorded primary hosts

Pinaceae : Picea abies *, glauca , koraiensis , mariana , orientalis , pungens , sitchensis .

Distribution

D F N S.

Figures

Fig. 8. Adelges (Adelges) laricis Vallot, 1836. Galls on Picea abies. A, D. Almost mature. B. Young. C. Half-grown. E. Abandoned gall (in winter).

Fig. 9. Adelges (Adelges) laricis Vallot, 1836. A. Sexupara (after Carter 1971, modified and redrawn from Heie 2004). B. Antenna of gallicola (after Annand 1928, modified).